Experimental study of high mining-induced stress evolution characteristics of downward relieving mining in Paner coal mine

According to the geological and mining technical conditions of the seams No. 8 and No. 6 of closed coal seams group in Paner deep coal mine, the 2D similar material simulation model of seams No. 8 and No. 6 is designed by using relieving mining method from up to down to study high stress evolution. Based on mining-induced stress monitoring by using pressure sensor, disturbance stress and strata migration after seams No. 8 and No. 6 mined; and the impact of irregular pillar on stress evolution are systematically analyzed; then the high stress evolution characteristics in roof and floor of seam No. 8 and strata movement, mining-induced stress, mining-induced fissure, weighing characteristic of seam No. 6 are were obtained; and the development patterns of mining-induced stress and mining-induced fissure influenced by irregular pillar are obtained. Research results not only provide a theoretical basis for mining power disaster prevention with mining-induced abutment stress evolution as its leading factor, but also provide technical support for the design and optimization of parameters of longwall mining by using relieving mining method.